Add cache busting querystring to block definition files

[skttl]

When adding custom views / stylesheets / thumbnails to a block definition, you choose between static files. This is fine - but we generally cache static files almost infinitely, and rely on the asp-append-version tag helper in our frontend to make sure the cache is busted when needed.

It would be nice, if Umbraco could do something similar when fetching the assets, especially the view and the stylesheet.

IIRC, the Property Value Converter does something to convert a database value to an editorvalue. In here we could inject IFileVersionProvider and use that to get the current file version, and append it as a querystring.

This way we get our extreme caching, but we bust it when needed.

Currently my workaround is to use custom middleware, that triggers if a querystring contains v=auto, and redirects the request to eg. main.css?v=G3TuWl9se8I19ihg4VRQoYIYrBSohtJSzxY4mJhmG-8. But this requires me to add the querystring through the database (or by tampering with uda/usync files)